Characterization of casting defects in a Fe-rich Al-Si-Cu alloy by microtomography and finite element analysis
Characterization of casting defects in a Fe-rich Al-Si-Cu alloy by microtomography and finite element analysis
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DOI：
10.1016/j.engfracmech.2017.03.015
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发表时间：
2017-10
影响因子：
5.4
通讯作者：
I. Bacaicoa;M. Wicke;M. Luetje;F. Zeismann;A. Brueckner-foit;A. Geisert;M. Fehlbier
中科院分区：
文献类型：
--
作者：
I. Bacaicoa;M. Wicke;M. Luetje;F. Zeismann;A. Brueckner-foit;A. Geisert;M. Fehlbier
采用显微层析成像和有限元分析对富铁Al-Si-Cu合金的铸造缺陷进行了表征。在高分辨率计算机断层扫描中分析试样，并在渲染软件中分割铸件缺陷的3D几何形状。识别了各种形状的缩孔以及大的板状Al-Al 5 FeSi夹杂物，并将其三维体积模型导入到有限元软件工具中，以计算由这些缺陷引起的应力集中系数。在收缩孔的情况下，最大Kt因子范围为4.73和14.56，位于孔和树枝状臂的收缩孔。对于α-Al 5 FeSi颗粒，最高的应力集中系数位于边缘和突起的夹杂物和范围之间的1.74和3.46。观察到这些α-相的大簇，其中保留了微孔。热处理后，合金中的Al_5FeSi夹杂物发生了明显的破碎和溶解，合金的塑性和强度得到了提高。
The casting defects from a Fe-rich Al-Si-Cu alloy were characterized by micro tomography and Finite Element Analysis. The specimens were analyzed in a high resolution computed-tomography scan and the 3D geometry of the casting defects were segmented in a rendering software. Shrinkage pores of various shapes as well as large plate-like ß-Al5FeSi inclusions were identified and their 3D volumetric model was imported into a FE software tool in order to calculate the stress concentration factors caused by these defects. In the case of the shrinkage pores, maximum Ktfactors ranging from 4.73 and 14.56 were obtained located at the holes and dendritic arms of the shrinkage pores. For the ß-Al5FeSi particles, the highest stress concentration factors were located at the edge and the protuberances of the inclusions and ranged between 1.74 and 3.46. Large clusters of these ß-phases were observed, in which micro-pores were retained. After heat treatment, a significant fragmentation and dissolution of the ß-Al5FeSi inclusions was found together with an increase in the ductility and ultimate strength of the alloy.